2. amps-preamps
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How much hum is normal from a new tube amp

I just bought a great sounding Lab12 Suara KT120 tube amp. The issue I am having is a hum that is coming from the transformers. I can hear it with no music playing faintly from my listening position 12 ft. away. The question is, should I return it, or is this normal acceptable. 

blue-magoo
mc1969
76 posts
 

No hum here, ever. 

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blue-magoo OP
150 posts
 

@macg19 

 

The seller TMR has been great. They are going to take it back inspect and either repair , replace, or refund my choice. Which amp do you have? If I can ask.

blue-magoo's avatar
blue-magoo OP
150 posts
 

@auroravengeance 

How long have you owned the Lab12 Integre4 MKII. Im asking because i heard the the hum can develop later or if you have a slight hum it can get worse. 

macg19
1,076 posts
 

Which amp do you have? If I can ask.

Of course - details in my profile but it’s a Rogers High Fidelity EHF-200 MK2. I’ve had it just over 2 months. Very happy. It replaced a Raven Audio Osprey which was fantastic but I wanted more power to drive my Harbeth’s.

macg19
1,076 posts
 

Correction, sorry.

There is a very faint hum from the amp on start-up, that goes away once it’s fully on and warmed up for a few minutes

The faint hum on start up is from the speakers - fades after 10-15 seconds - the amp is dead quiet.

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